Kinetic Study of Copper(II) Simultaneous Extraction/Stripping from Aqueous Solutions by Bulk Liquid Membranes Using Coupled Transport Mechanisms

Abstract

Heavy metals removal/recovery from industrial wastewater has become a prime concern for both economic and environmental reasons. This paper describes a comparative kinetic study of the removal/recovery of copper(II) from aqueous solutions by bulk liquid membrane using two types of coupled facilitated transport mechanisms and three carriers of different chemical nature: benzoylacetone, 8-hydroxyquinoline, and tri-n-octylamine. The results are analyzed by means of a kinetic model involving two consecutive irreversible first-order reactions (extraction and stripping). Rate constants and efficiencies of the extraction (k 1 , EE) and the stripping (k 2 , SE) reactions, and maximum fluxes through the membrane, were determined for the three carriers to compare their efficiency in the Cu(II) removal/recovery process. Counter-facilitated transport mechanism using benzoylacetone as carrier and protons as counterions led to higher maximum flux and higher extraction and stripping efficiencies due to the higher values of both the extraction and the stripping rate constants. Acceptable linear relationships between EE and k 1 , and between SE and k 2 , were found.

Modified LIX®84I-Based Polymer Inclusion Membranes for Facilitating the Transport Flux of Cu(II) and Variations of Their Physical–Chemical Characteristics

“…Another important parameters which are able to shed information on bulk membrane modifications associated to V10 contents are the electrical conductivity and the dielectric constant [ 29 ]. For this reason, membrane conductivity and dielectric constant are determined based on Equations (14) and (15) by taking into account the expressions for homogeneous conductors and plane plate capacitors, respectively [ 20 , 30 ]: where , , and , represent the membrane thickness, membrane area, and the vacuum permittivity, respectively. R m and represent the membranous electrical resistance and equivalent capacitance, respectively.…”

“…The kinetics of the transport across the PIMs was described as a consecutive first-order reaction scheme, which is described in Reference [ 20 ]. where and are the rate constants for the feeding and the receiving reactions.…”

The extraction of nickel by emulsion liquid membranes using Cyanex 301 as extractant

“…Thus, it is a first‐order kinetics reaction. Based on these results, in order to obtain least square error minimization and more accuracy in parameter estimation, an integrated form of the non‐linear regression model (Figure ) was employed based on Equation (9) in Appendix V . The mass transfer coefficients for the organic phase and the emulsion phase were calculated to be 3.192 × 10 −7 (m/s) and 2.823 × 10 −7 (m/s).…”

Kinetic Study of Cd(II) Ions Extraction Using Trioctylamine as Carrier in Bulk Liquid Membrane (BLM)

“…The carrier-solute complex will be broken down, leading to the stripping of Cd(II). 17 Following this is the carrier regeneration process that results in a new reaction cycle. The Cd(II) ions transport mechanism is therefore a coupled counter ion transport, with Cd(II) and OHions travelling in the opposite direction.…”